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Below you have a style which applied to your textbox will make it fully transparent. The difference between applying this style and simply setting the Background property of your textbox to transparent or removing it completely is that the style also removes the focus effect the textbox gets when tapped. I mean no matter what background color you set when the textbox gets focused the background turns white.

So here’s the style (you need to add this to your app/page/user control resources):

Okay, so this happened to me twice already and in both cases it stopped working after installing the Visual Studio 11 Dev Preview. Having already two PCs on which Expression Blend stopped working I decided to do a little bit of digging and fortunately for me it really took just a bit. The crash is actually a known issue caused by the installation of .NET Framework 4.5 or Visual Studio 11 Dev Preview and the solution for it is rather simple and only takes a couple of minutes.

So what you need to do is open up a command prompt window with administrative privileges and run the commands listed below. Those of you running 32-bit operating systems use %ProgramFiles% instead of %ProgramFiles(x86)%.